/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 晓星航
 * Date: 2023-03-16
 * Time: 15:05
 */
class MyCircularQueue {
    public int[] elem;
    public int front;//队头下标
    public int rear;//队尾下标
    public MyCircularQueue(int k) {
        this.elem = new int[k + 1];
    }

    /**
     * 入队操作
     * @param value
     * @return
     */
    public boolean enQueue(int value) {
        if (isFull()) {
            return false;
        }
        this.elem[rear] = value;
        //rear++;
        rear = (rear + 1) % elem.length;
        return true;
    }

    /**
     * 出队操作
     * @return
     */
    public boolean deQueue() {
        if (isEmpty()) {
            return false;
        }
        front = (front + 1) % elem.length;

        return true;
    }

    /**
     * 得到队头元素
     * @return
     */
    public int Front() {
        if (isEmpty()) {
            return -1;
        }
        return elem[front];
    }

    public int Rear() {
        if (isEmpty()) {
            return -1;
        }
        int index = -1;
        if (rear == 0) {
            index = elem.length - 1;
        } else {
            index = rear - 1;
        }
        return elem[index];
    }

    public boolean isEmpty() {
        return front == rear;
    }

    public boolean isFull() {
        //rear的下一个是front
        if ((this.rear + 1) % elem.length == front) {
            return true;
        }
        return false;
    }
}
public class TestDemo {
    public static void main(String[] args) {

    }
}
